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- 2. A prescription balance has a sensitivity requirement of 5 mg. Using this balance, how would you weigh 12 mg of drug with an accuracy of + 5% using a suitable diluent such as Lactose?When the compounds analyzed by Robrob were passed on to the next test, another scientist, Kikoko, needed to determine the molecular weight of the ctive compound. They created a solution with a concentration of 20.0%w/w from the solid active compound and the solution had a density of 1.40 g/mL. From this solution, 10µL was taken and mixed with 190µL of reagent and water. It was analyzed and showed a concentration of 5x10-4 M compound. a. What is the concentration (in molarity) of the 20%w/w solution? b. Why was the concentration of the solution expressed as %w/w initially? c. What is the molecular weight of the active compound?Select one: O True O False To make a w/o emulsion you will need a surfactant with low HLB value; e.g., 6. Select one: O True O False
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